#ifndef _BUFFER_H_
#define _BUFFER_H_

#include <stdlib.h>
#include <sys/types.h>

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include "settings.h"
//定义buffer
typedef struct 
{
	char *ptr; 		//指向存储空间

	size_t used; 	//buffer中数据的长度
	size_t size; 	//buffer的长度
} buffer;

//定义buffer数组
typedef struct 
{
	buffer **ptr; 	//buffer指针数组

	size_t used; 	//buffer数组中数据的个数
	size_t size; 	//buffer数组的大小
} buffer_array;

/*
 * 这个比较有意思
 */
typedef struct 
{
	char *ptr;

	size_t offset;				/* input-pointer */

	size_t used;				/* output-pointer */
	size_t size;
} read_buffer;

/*
 * buffer数组的操作函数
 */
buffer_array *buffer_array_init(void);
void buffer_array_free(buffer_array * b);
void buffer_array_reset(buffer_array * b);
buffer *buffer_array_append_get_buffer(buffer_array * b);


/*
 * buffer的操作函数
 */
buffer *buffer_init(void);
buffer *buffer_init_buffer(buffer * b);
buffer *buffer_init_string(const char *str);
void buffer_free(buffer * b);
void buffer_reset(buffer * b);

int buffer_prepare_copy(buffer * b, size_t size);
int buffer_prepare_append(buffer * b, size_t size);

int buffer_copy_string(buffer * b, const char *s);
int buffer_copy_string_len(buffer * b, const char *s, size_t s_len);
int buffer_copy_string_buffer(buffer * b, const buffer * src);
int buffer_copy_string_buffer_len(buffer * b, const buffer * src, size_t len);
int buffer_copy_string_hex(buffer * b, const char *in, size_t in_len);

int buffer_copy_long(buffer * b, long val);

int buffer_copy_memory(buffer * b, const char *s, size_t s_len);

int buffer_append_string(buffer * b, const char *s);
int buffer_append_string_len(buffer * b, const char *s, size_t s_len);
int buffer_append_string_buffer(buffer * b, const buffer * src);
int buffer_append_string_buffer_len(buffer * b, const buffer * src, size_t b_len);
int buffer_append_string_lfill(buffer * b, const char *s, size_t maxlen);
int buffer_append_string_rfill(buffer * b, const char *s, size_t maxlen);

int buffer_append_long_hex(buffer * b, unsigned long len);
int buffer_append_long(buffer * b, long val);

int buffer_copy_off_t(buffer * b, off_t val);
int buffer_append_off_t(buffer * b, off_t val);

int buffer_append_memory(buffer * b, const char *s, size_t s_len);

char *buffer_search_string_len(buffer * b, const char *needle, size_t len);

int buffer_is_empty(buffer * b);
int buffer_is_equal(buffer * a, buffer * b);
int buffer_is_equal_right_len(buffer * a, buffer * b, size_t len);
int buffer_is_equal_string(buffer * a, const char *s, size_t b_len);
int buffer_caseless_compare(const char *a, size_t a_len,
							const char *b, size_t b_len);

typedef enum 
{
	ENCODING_UNSET,
	ENCODING_REL_URI,			/* for coding a rel-uri (/with
								 * space/and%percent) nicely as part of a href */
	ENCODING_REL_URI_PART,		/* same as ENC_REL_URL plus coding / too as %2F 
								 */
	ENCODING_HTML,				/* & becomes &amp; and so on */
	ENCODING_MINIMAL_XML,		/* minimal encoding for xml */
	ENCODING_HEX,				/* encode string as hex */
	ENCODING_HTTP_HEADER		/* encode \n with \t\n */
} buffer_encoding_t;

int buffer_append_string_encoded(buffer * b, const char *s,
								 size_t s_len, buffer_encoding_t encoding);

int buffer_urldecode_path(buffer * url);
int buffer_urldecode_query(buffer * url);
int buffer_path_simplify(buffer * dest, buffer * src);

int buffer_to_lower(buffer * b);
int buffer_to_upper(buffer * b);

/** deprecated */
int LI_ltostr(char *buf, long val);
char hex2int(unsigned char c);
char int2hex(char i);

int light_isdigit(int c);
int light_isxdigit(int c);
int light_isalpha(int c);
int light_isalnum(int c);

#define BUFFER_APPEND_STRING_CONST(x, y) \
	buffer_append_string_len(x, y, sizeof(y) - 1)

#define BUFFER_COPY_STRING_CONST(x, y) \
	buffer_copy_string_len(x, y, sizeof(y) - 1)

#define BUFFER_APPEND_SLASH(x) \
	if (x->used > 1 && x->ptr[x->used - 2] != '/') { BUFFER_APPEND_STRING_CONST(x, "/"); }

#define CONST_STR_LEN(x) x, x ? sizeof(x) - 1 : 0
#define CONST_BUF_LEN(x) x->ptr, x->used ? x->used - 1 : 0

#define UNUSED(x) ( (void)(x) )

#endif
